Microwave transition plate for antennas with a radiating slot face

Abstract

A microwave antenna has a rectangular section waveguide with two narrow walls and and two broad walls. Towards one end, the waveguide is coupled with a microwave transition by which a coaxial connector can be coupled to the waveguide. The transition has a conductor extending through a narrow wall and connected internally with a transition plate. The transition plate extends longitudinally, centrally along the waveguide and is stepped to provide a quarter wave section.

1. A microwave transition comprising:
 a waveguide of rectangular section, said waveguide having two narrow walls and two broad walls; 
 a radiating face provided by a first of said two narrow walls; 
 a first conductor extending through a second of said two narrow walls; and 
 a transition plate attached with said first conductor within said waveguide, 
 wherein said transition plate is aligned centrally between said two broad wall of said waveguide and extends lengthwise in contact with an internal surface of one of said two broad walls parallel to said radiating face, and 
 wherein the height of said transition plate is greater adjacent said first conductor than away from said first conductor. 
 
   
   
     2. A microwave transition according to  claim 1 , wherein said transition plate is stepped to a reduced height away from said first conductor. 
   
   
     3. A microwave transition according to  claim 2 , wherein said transition plate provides a quarter wave section. 
   
   
     4. A microwave transition according to  claim 1 , wherein said transition plate tapers to a reduced height away from said first conductor. 
   
   
     5. A microwave transition according to  claim 1 , wherein a cylindrical outer conductor extends around a part of the length of said first conductor. 
   
   
     6. A microwave transition according to  claim 5 , including a dielectric member located between said first conductor and said outer conductor. 
   
   
     7. A microwave transition according to  claim 1 , wherein said first conductor comprises two axially aligned parts, and wherein a dielectric material is supported between said two parts of said first conductor in a hole in said narrow wall. 
   
   
     8. A microwave transition according to  claim 1 , wherein said first conductor has a portion extending parallel to one of said two narrow walls. 
   
   
     9. A microwave transition comprising:
 a waveguide of rectangular section, said waveguide having two narrow walls and two broad walls; 
 a radiating face provided by a first of said two narrow walls; 
 a first conductor extending through a second of said two narrow walls; and 
 a transition plate attached with said first conductor within said waveguide, 
 wherein said transition plate has a flat edge and a stepped edge opposite said flat edge, 
 wherein said plate is aligned centrally between said two broad wall of said waveguide and extends lengthwise with said flat edge in contact with an internal surface of one of said two broad walls parallel to said radiating face, and 
 wherein the height of said transition plate steps down away from said first conductor. 
 
   
   
     10. A microwave transition comprising:
 a waveguide of rectangular section, said waveguide having two narrow walls and two broad walls; 
 a radiating face provided by a first of said two narrow walls; 
 a first conductor extending through a second of said two narrow walls and having a right-angle bend externally of the waveguide such that a free end of the first conductor extends parallel with said two narrow walls; and 
 a transition plate attached with said first conductor within said waveguide, 
 wherein said transition plate is aligned centrally between said two broad wall of said waveguide and extends lengthwise in contact with an internal surface of one of said two broad walls parallel to said radiating face, and wherein the height of said transition plate is greater adjacent said first conductor than away from said first conductor. 
 
   
   
     11. A microwave antenna including a transition comprising:
 a waveguide of rectangular section, said waveguide having two narrow walls and two broad walls; 
 a radiating face provided by a first of said two narrow walls; 
 a first conductor extending through a second of said two narrow walls; and 
 a transition plate attached with said first conductor within said waveguide, 
 wherein said transition plate is aligned centrally between said two broad wall of said waveguide and extends lengthwise in contact with an internal surface of one of said two broad walls parallel to said radiating face, and 
 wherein the height of said transition plate is greater adjacent said first conductor than away from said first conductor. 
 
   
   
     12. A microwave antenna according to  claim 11  including a slotted wall disposed in said radiating face and a polarization grid disposed adjacent said slotted wall externally of said waveguide.